THE NAUTILUS. 27 



Oklahoma : Oklahoma City (Ferriss); Cimmaron River (Call). 



Oregon : Willamette River; Salem; Portland (Pils.). 



Pennsylvania : Delaware River (type locality), Say; Allegheny 

 River; Round Island, Clinton Co.; Port Allegheny, McLean Co.; 

 Youghiougheny River, Connellsville, Fayette Co.; Juniata River, 

 Hollidaysburg, Blair Co.; Susquehanna River, Muncy; Cusbclishia 

 Creek, Indiana Co.; Emporium, Cameron Co.; Amity Twp., Berks 

 Co.; Beaver River, Waupum, Montgomery Co.; Germantown and 

 various localities, Philadelphia Co.; Nockamixon, Bucks Co.; 

 Schanksville, Somerset Co.; Glenolden, Delaware Co.; Gettysburg; 

 Ligonier, Westmoreland Co., York Furnace, York Co. (Pils.); Alle- 

 gheny Co. (StupakofF); Ohio River, Coraopolis (Rhoads); Chester 

 Co. (Hartman & Michener); Lancaster Co. (Haldeman); Columbia; 

 Susquehanna River, Wilkesbarre (Walker). 



Rhode Island : Providence and Worcester Canal; Cunliff's Pond 

 (Carpenter). 



South Carolina : None. 



South Dakota : Mouth of Big Sioux River (Lea). 



Tennessee : Emory River and Harriman (Pils.); Chilhowee Mts.. 

 Blount Co.; Franklin Co. (Walker); Tellico River, Blount Co. 

 (Lewis); Little River (Ferriss MSS). 



Texas: New Braunfels (Pils.); San Antonio (Walker); Peder- 

 nales River, Gillespie Co.; Brushy Creek, Williamson Co.; Colorado 

 River and tributaries, Comal Co.; San Marcus River, Hayes Co.; 

 Colorado River and tributaries, Travis Co.; Burton, Washington 

 Co. (Singley); Hog Creek, McLennan Co. (Strecker). 



Utah : None. 



Vermont: Connecticut River, Hartland (Pils.); Middlebury 

 (A ms) 



Virginia: Luray (Pils.); Orange (Walker); Harper's Ferry 

 (Tryon). 



Washington: Cascades, Skamania Co. (Pils.). 



Wisconsin : Milwaukee (Pils.); Menominee River; Wauwatosa ; 

 Honey Creek, Layton Park; Kinnickinnic River, Milwaukee ; 

 Golden Lake, Waukesha Co.; Little Cedar Lake, Washington Co.; 

 Lake Winnebago, Calumet Co.; Kenosha (Chadwick). 



West Virginia : Four miles from Romney; Kanawha River, forty 

 miles south of Ohio River, Wirt Co.; North River, Sedan, Hamp- 

 shire Co.; Warm Spring Creek, Morgan Co.; Salt Sulphur Spring, 



